Why seashells are tougher than chalk (video)

WASHINGTON, June 7, 2018 -- Seashells are made mostly of calcium carbonate, also known as chalk, a mineral soft and crumbly enough to use for sidewalk doodles. Yet seashells are tough and resilient. In this video, Reactions explains why seashells are so different, and why you can't use them to draw on your driveway: https://youtu.be/iUeMxjkSPyM.

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Carbon dots make calcium easier to trackProf. DONG Wenfei's research group from the Suzhou Institute of Biomedical Engineering and Technology (SIBET) has developed a new type of fluorescent carbon dot that can effectively detect calcium levels in cells.

The dinosaur menu, as revealed by calciumBy studying calcium in fossil remains in deposits in Morocco and Niger, researchers have been able to reconstruct the food chains of the past, thus explaining how so many predators could coexist in the dinosaurs' time.

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